Re: Directory name completion blocks when it shouldn't

[Richard Stallman]

    With M-x cd, entering "/t" TAB completes to "/top-dir/" like it should,
    but "/top-dir/s" TAB does NOT complete to "/top-dir/sub-dir/" even though
    there is only 1 matching directory (TAB TAB shows only "sub-dir" as only
    alternative); it's necessary to disambiguate the directory name from the
    names of any and all files in the same location for tab completion to
    proceed.  This seems like a bug.

That is correct behavior, because subdirectory names are NOT the only
valid inputs.  Suppose the directory also contains img_0304.jpg,
img_0305.jpg, ... img_0315.jpg.  You might want to type `i TAB *.jpg'.